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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4078eba6ac141501c6b54e5fbb4d92ea688118540ef374f374e33713a8536895' 
  AND token = 'dD/4GpF0cNCJq5SobQAOnqhWIQjNw9xDDikz0MaZdcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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