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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23aefd138b6abb8c8c82742a6a5250957941394a2bfc574f129d3c4c4a77bf3c' 
  AND token = 'H1EKLDxNqTpxaNq3A2ikAQ21J8F72k5D9jpGkvgrH/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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