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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cc94e187085f71f27c95c2b017d8704946ce6942f2a3704db3d2b155c984543' 
  AND token = 'x4zK3G6xv7KxuBXnzDB48Nu3soVfk4frkPXfM97yM5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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