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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f52f88d289342dcb726bef884e11c7f32d60633c4e2dc9f163ee2c426eddb82' 
  AND token = 'v5EalZflU6XrwcL29NSSEFoo1Y9bWHktj4lfC9hJxHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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