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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd08fb83836a4b32ba2b51ebc0a029426560f5578bba3e9a62bf266531629804' 
  AND token = 'pQ4p0GdECFznMebuYXih+PhS6h29Eqi76U8Lrye4euY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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