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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a6b616991c180aee878a2abb6ba30050824c1f5e3575f7de95b015ac1b2aad7' 
  AND token = '5IF+xTU8UjufZwAVvf5FA/tfIDA4XnTeLQE39xYZxEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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