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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aee56d65559e8a362ceadffcf4acae6217b83bef42b28eae584cdd2837f4a3a4' 
  AND token = '1c0/YkUw3Mb0JaQcw5NUQDl2CABrvqA08CD/FYF05RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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