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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbc02ca0847e70a83b4ebc78d119ebddca375e07ac6e41fa491f12a479be4b72' 
  AND token = '33Ca4BcP42GlMFLf857PErL4Lf03Yw3GQvqZq8Cy5X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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