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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e973c563ffd0f042215e7986b4869ca1c83185e4e7a33d01eaacd5ec3924bd2' 
  AND token = 'n4MQ8SQdZLp9/n6MJiyzK4ydD7HVwdxHGCG9TkGez40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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