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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91332b6deb638a26b7f56207d750baeb08a5c8e3205be31bbef57f535f1a2003' 
  AND token = 'Db/O8dAVTSFptokTkx7i0MW5AUI2/jB714qR8i4Q/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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