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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4361676590d72ec102596955af57b640e10619a3c265a2616160134734f8ae3' 
  AND token = 'Ew/gYf1/KO3CLWwgdxFEzhKVdlH2p6eV7R7Y0ROCy6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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