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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea9988d6482b620e3fcccbef95e8aa9a9df68abc2be37be71f679a75577ea851' 
  AND token = '4U97I2QMpVpKmzx69Yd/a502MF7yC+FYeTBJn0jSp/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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