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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ad07d85b771e60f91c72a33c60c5e1cfdab5290cbd9b688ccb50a1f8f262a90' 
  AND token = 'RCxeCH/8z/JeoyTQMHaC0TLvsyD4dEr+URcfOIOP4jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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