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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cac34b991d6778ad7c08428bc424b1cab85067f21701778c3e8e93a447b627e' 
  AND token = 'Rif5zWdvHFd0U4AGiblUb0tfNObGjct68X1EbwnUmxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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