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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ba9c7564ba6474e7d112172b5c41835566f23358e227b34a2ee57c855f8f679' 
  AND token = 'EUeCVxsc/9/L7RkBUOKrLrSr0f881T/8dyeJgyouuqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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