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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b73cd01422cdc0caa27b738480d5b20aacfd450fe7315f5e83e55c8763813d30' 
  AND token = 'Oj5CK9QONykq4lCmkbBYJ/lk2DrdlU/KCGOFdc/WKDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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