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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c9ae0813bd7d97822d5ba35d7b0d0d92d3014bbb73cb90565776f5a652e4157' 
  AND token = 'nvwLTrdW5fLZQ6f6IU1WyFy9RrEFerCzfWtChyoQOlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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