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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb11823f4aaa9b385b219ecec3301d16755c9bee7cbdb92002b2512e7b3c3e6' 
  AND token = 'GKTnCQJSedln/OO14bMWnY5CEdUOjKI55vjI97jscCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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