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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21ea538ab92460ac9dee2076f8e4cfb5d8e7306fc96df6c88717fdd9fbc69b38' 
  AND token = 'hQboJC7BphPw7Ef2DjwQGYfNRbSkruxLuk7phwuUOjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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