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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ead534dc8e3a2411bc94bf92f6138aea301ad9ec16413f8826efc302e82c81a' 
  AND token = '8/iUejsbcyLYk1FzoQE26u45JmoFmhRQWMoGxP8AiKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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