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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e15c7cc765b4fac530b9f6a966f12d7c51f870d14379f39baecf86b67482ff0' 
  AND token = '0+4NgLbpza4+rDsr2YP2Sc/vDT380XyH3R5p2Ycn8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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