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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e01210b0d6cb4aa79b5f7e3c12a436ef170266a318b5b293cbf59236318fbbd' 
  AND token = 'LalrMbA0F5HIK12w2UygzYqdvkn1XUU2iW8a/UW+uIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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