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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce702a4346a4388bce7a700c088c7214cb1845532abf472c6ecc92c9d94a699e' 
  AND token = 'rMa36wgiEVFRIDRPn+wkleAkTQ2I+QNgqfqbt8Az4sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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