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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d8f5aa15456f302f5f3c8b695e29f8ba5d57dc8bc54654e4d53f117c65e8dc4' 
  AND token = 'Zs0icz1mCI+FXamECnAy9QT3+vYt7yubaewQqFVPDuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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