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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82dfdff01bf88cbcaa71faf70f6daa52c851992d9c967d30c1a727fa2b1868d6' 
  AND token = 'rhfjKu/PlIiSqzEZ0sopWXNUmwYjYwW6E5+m1uAr9Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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