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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '636280c9c22c77d7f92f4df6959d3d49e7d9c4aade29c1b62acdb7560fbf3038' 
  AND token = 'x7r/+EhV4Hd0MiMZ5qi1I1R7Bz0abfUlKNdra08Ir/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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