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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a615830a22665ebaf16aee2ca9ef9b229d637d961cbbb32e0fbd03fb9eefae47' 
  AND token = 'Zuf8PhHNkwZMDTlQnmBv5BewZONw+g/Zn31kKiL6Mx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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