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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab6433e1ee7e70c48b46be102bd93ee4251f0695895005e8881f498402f7844f' 
  AND token = 'kOWkZvZBI0RtY/qq9aaq8PHuIXEOadHwN0WzB1YOHS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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