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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5def1d36ff8317d2804b3e74fb091d9c29f25a546c46eee08a330e654f2ef98' 
  AND token = '4ktUuwucYgwLaqX5o341OyrM7tExQFFyx7OZgx3yQRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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