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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '517af28f7f3babb776eab5f0f7d0fec4cf1d105dd85540e805e322cfe55f7df3' 
  AND token = 'v/YuToQ9AUI3qXRs3CtEK6efR0S14ug7XjBGz5oNBaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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