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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd678a15ac58c9a3b88a20a1ff93ebad4cf15611abeb1ca2c16632b54fa99eb8a' 
  AND token = 'xfiYg6YmROVSJQIzNt8OIUkebO9FjeCT1VUY5X0rf2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}