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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9973d8e29d0324e35a8b4c299500eb99ec3c29ae204de01b683adf12f803ebf' 
  AND token = 'aIkzPP4mAvlgVTAn2BVcswfT3YMK/HWZO4fH5V/RwD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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