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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1871e8988e2f2bebfc993f410e4f7725cef6c5b1a558a7a7885231be6a68a180' 
  AND token = 'xuL2bg96Fmx7dMQUgLaQCDDSrgf+PjkacRRx4KFD09k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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