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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3554cbe71e95d6d96e2e621819fcf7ebacd339f4146f83b92e53e871d9aa325' 
  AND token = '0bmtKbKNxEYy5Wf6VencZ9ymLWLfPaKkHdhkUFBbvws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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