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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5d63d79aca0f18b5ccd48bcda031cdcda2b079d114056df179412b0e3ced4d3' 
  AND token = 'dr6blgWVnskGUcMOi7hT60cVsNmAk6XVrnBhmVEjLKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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