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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '959b61f9a48a82104cc8b8245783509b537251a7a66165b8b5ee9bed85ab40d2' 
  AND token = '/6pAP+Z9EpR1IhUMm1+5EQjOeUNQvBaQM073RSLisoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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