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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df200add59c6be132149ea734f2f56865a62068bdc600a121fc2cc3463980038' 
  AND token = '1Xq9FRlCaLn+xu9YViC8+S6LyKFdWAVzUm3NyZb8QxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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