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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b11a9225fc19c4080ad3c01f2887d80d443f1b839241a5434963b9b4a713c34b' 
  AND token = 'oTtZBX/BRabumSHXcnHl74D7YxVNExBgoyG3+PulDX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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