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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdcba1041667e62b4034c2c614a566c3d2ff09cd9b2c40964b5d3773ab8776f4' 
  AND token = 'BPFdpYYk1CkeMz4buDW6krEx3GCDmgG5L0NubMQ/JYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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