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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10dbf79ac8be1a3e39993242d01a5d3a93345b10eeb92385c0c22c1a901e42dc' 
  AND token = 'MP/chTcffKXAtk+8KRCxpGZjhZCKfWnor23Cb8Urmgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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