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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2015947d899a03bc89b43a57cb1a1d1116aacfe6aae2a822838ac01262a85749' 
  AND token = '06guq1dPaamtTIzMX4o+x+EXt+BQq7lCtxyAbMwrTZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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