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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45f486179d2b22bcbe9880ae93a19bc4a583e0eaa8a378a0fab6e5c10225a19b' 
  AND token = '/ve0gR+585jz3xU1MPqh+feJTBifJdqyNF1bb0GGi9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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