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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0878c9adfe2e8be6ce39a2b22d571f5097473da8003175eaf944fb56238f512a' 
  AND token = 'a2Grrd35eiNbyrNeJ+KOgiKGBpX3ZLpoDehRsUacyqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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