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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c76d490707065e9b9900d449a045e7885860b0875d5f72eb6c78b9e9ce02858e' 
  AND token = 'wEhf+Qs55GYKbpx7T7QBT8TChS8pV9OothnpaOk1/oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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