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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b8a76ad6a849115e10e3c45ca86c52df47a5713769ef4e50d014ce524c361d9' 
  AND token = '5mjqnUUBp4JefZrl/afZNfhAoXqTI4Qg+PH1a2d5LiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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