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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d974ff7cfbcc3a86ef9979c7dbdee60ab038f2a45bda23c2422b35814192514' 
  AND token = 'PXIOTEo0NBaPStjs0prEBwxb5GmmgAEk6zDvdws3QbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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